EP0489929B1 - Sendevorrichtung für eine gemeinschaftsantennenanlage - Google Patents

Sendevorrichtung für eine gemeinschaftsantennenanlage Download PDF

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Publication number
EP0489929B1
EP0489929B1 EP91912067A EP91912067A EP0489929B1 EP 0489929 B1 EP0489929 B1 EP 0489929B1 EP 91912067 A EP91912067 A EP 91912067A EP 91912067 A EP91912067 A EP 91912067A EP 0489929 B1 EP0489929 B1 EP 0489929B1
Authority
EP
European Patent Office
Prior art keywords
signal
scramble
scrambling
satellite
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91912067A
Other languages
English (en)
French (fr)
Other versions
EP0489929A1 (de
EP0489929A4 (en
Inventor
Akihisa Sugimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0489929A1 publication Critical patent/EP0489929A1/de
Publication of EP0489929A4 publication Critical patent/EP0489929A4/en
Application granted granted Critical
Publication of EP0489929B1 publication Critical patent/EP0489929B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible

Definitions

  • the present invention relates to a CATV transmission installation which receives television programs by means of a communications satellite and supplies them to general homes.
  • a program transmission equipment called a heat end in the CATV transmission installation comprises a line controller 1 for controlling the scrambling operation of a pay program, video scramblers 3 and 3′ for performing scrambling operation over video signals a and a ′ received from a video source 2 of a pay program on the basis of a control signal b received from the line controller 1 respectively, television modulators 4 and 4′ for converting scrambled video signals c and c ′ received from the video scramblers 3 and 3′ into RF television signals d and d ′ respectively, and a mixer 5 for mixing the television signals d and d ′ received from the respective channels and for sending a mixed signal to a transmission line.
  • the control signal b is sent from the line controller 1 to the video scramblers 3 and 3′ at the same time.
  • a CATV transmission installation in accordance with the present invention comprises a satellite receiver for receiving and demodulating a scrambled television signal of a specific channel from a communications satellite, a data decoder for decoding a scramble control data from an output video signal of the satellite receiver, and a single or a plurality of scramblers for scrambling a single or a plurality of video signals received for a different television channel on the basis of the scramble control data decoded by the data decoder.
  • the scrambler for a channel different from the communications satellite channel scrambles the video signal with use of the scramble control data for the communications satellite television signal decoded by the data decoder, whereby the scrambling format of the scrambler can be made equal to that of the communications satellite television signal.
  • FIG. 1 there is shown an arrangement of a heat end in a CATV transmission installation in accordance with an embodiment of the present invention.
  • a scramble control data is simultaneously transmitted in order to control a descrambler installed in a subscriber terminal or a head end.
  • this scramble control data is multiplexed on a video signal and on a subcarrier for transmission.
  • the subcarrier is used for the scramble control data.
  • reference numeral 12 denotes a satellite receiver which receives through a satellite antenna 11 a television signal of a satellite channel having the same format as the scrambling format of a CATV system, demodulates the television signal, and outputs a scramble video signal e and a subcarrier signal f to a scramble controller 13.
  • the scramble video signal e is sent from the satellite receiver 12 through the scramble controller 13 to a television modulator 14, where the scramble video signal e is converted into a television signal r of a specific CATV channel which in turn is sent through a mixer 15 to a transmission line.
  • the scramble controller 13 outputs to the TV modulator 14 a clamp signal g necessary for television modulation and a key signal h necessary for the descrambling of a subscriber terminal, and also subjects a data signal i for control of the subscriber terminal to an RF modulation and then outputs the signal i to the mixer 15.
  • Reference numeral 16 denotes a data detector which is provided to detect a scramble control data for a channel different from the satellite channel. More specifically, the data detector 16 extracts part of the subcarrier signal f received from the satellite receiver 12 and outputs a signal j to a data decoder 17. The data detector 16 may be incorporated in the scramble controller 13 in some cases. The data decoder 17 decodes the baseband data signal j received from the data detector 16, detects a data necessary for the scramble control therefrom to detect the change of a scrambling format and a TAG signal, and controls a video scrambler 18 on the basis of the detected data.
  • the video scrambler 18 scrambles a video signal l received from a video source 19 according to a scramble control data signal k received from the data decoder 17 and sends a video scramble signal m , a clamp signal n and a key signal p to a television modulator 20.
  • the television modulator 20 in turn, converts the received signals m , n and p into a television signal q for the specific CATV channel and sends the signal q via the mixer 15 to the transmission line.
  • the data detector 16 and the data decoder 17 enable the simultaneous modification of both the scrambling format of the satellite channel and the scrambling format of the video scrambler 18 and also enable the modification control of the TAG signal. In this way, the scrambling formats of the video scrambles 18 installed in the respective CATVs can be collectively modified.
  • the scrambling format of the scrambler can be modified at the same time as the modification of the scrambling format of the communications satellite television signal to be equal to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Radio Relay Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Liquid Crystal Substances (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Selective Calling Equipment (AREA)

Claims (1)

  1. CATV-Übertragungsanordnung mit einem Satellitenempfänger zum Empfangen und Demodulieren eines von einem Kommunikationssatelliten kommenden verschlüsselten Fernsehsignals eines bestimmten Kanals, einem Datendecoder zum Decodieren eines verschlüsselten Steuersignals eines Ausgangsvideosignals des Satellitenempfängers und einem einzelnen oder mehreren Verschlüsselungseinrichtungen zum Verschlüsseln eines einzelnen oder von mehreren Videosignalen, die für einen verschiedenen Fernsehsignal basierend auf den verschlüsselten Steuerdaten, decodiert durch den Datendecoder, erhalten wurden.
EP91912067A 1990-07-02 1991-07-02 Sendevorrichtung für eine gemeinschaftsantennenanlage Expired - Lifetime EP0489929B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2174902A JP3058894B2 (ja) 1990-07-02 1990-07-02 Ｃａｔｖ送信設備
JP174902/90 1990-07-02
PCT/JP1991/000890 WO1992000653A1 (en) 1990-07-02 1991-07-02 Transmitting device for catv

Publications (3)

Publication Number Publication Date
EP0489929A1 EP0489929A1 (de) 1992-06-17
EP0489929A4 EP0489929A4 (en) 1993-02-24
EP0489929B1 true EP0489929B1 (de) 1995-12-13

Family

ID=15986692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91912067A Expired - Lifetime EP0489929B1 (de) 1990-07-02 1991-07-02 Sendevorrichtung für eine gemeinschaftsantennenanlage

Country Status (5)

Country Link
EP (1) EP0489929B1 (de)
JP (1) JP3058894B2 (de)
AT (1) ATE131680T1 (de)
DE (1) DE69115454D1 (de)
WO (1) WO1992000653A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2730116A1 (fr) * 1995-01-31 1996-08-02 Thomson Broadband Systems Systeme de deport d'un embrouilleur de signal de television

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4348691A (en) * 1980-11-10 1982-09-07 Blonder-Tongue Laboratories, Inc. Master antenna subscription television system and the like
JPS59152787A (ja) * 1983-02-18 1984-08-31 Sanyo Electric Co Ltd 有料テレビジヨンシステムの制御デ−タ伝送方式
DE3484068D1 (de) * 1984-05-19 1991-03-07 Am Cable Tv Ind Inc Faelschungssicheres, ausweitbares uebertragungssystem.
GB2161679B (en) * 1984-07-06 1988-02-24 Cabletime Ltd Improvements in or relating to signal jamming apparatuses for frequency division multiplex systems
SE8406489L (sv) * 1984-12-19 1986-06-20 Nordspace Ab Televisionsmottagningssystem
JPS63263886A (ja) * 1987-04-21 1988-10-31 Maspro Denkoh Corp 有料テレビシステム

Also Published As

Publication number Publication date
JPH0465986A (ja) 1992-03-02
DE69115454D1 (de) 1996-01-25
EP0489929A1 (de) 1992-06-17
WO1992000653A1 (en) 1992-01-09
ATE131680T1 (de) 1995-12-15
EP0489929A4 (en) 1993-02-24
JP3058894B2 (ja) 2000-07-04

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